Return new Dimension within getPreferredSize() causing trouble

Question

attempting to compile this causes this problem:
C:\tryjava>javac SelfContainedPanel.java
SelfContainedPanel.java:44: missing method body, or declare abstract
public Dimension getPreferredSize();
^
SelfContainedPanel.java:46: return outside method
return new Dimension(150,100);
^
2 errors
When I comment out the getPreferredSize method, the size is all wrong, basically 2 pixels x 2 pixels....
I studied the Dimension API and the getPreferredSize method but it seems as if I'm doing things correctly??
//CODE
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SelfContainedPanel extends JPanel {
     private int x1,y1,x2,y2;
     public SelfContainedPanel()
          addMouseListener(
               new MouseAdapter() {
                    public void mousePressed(MouseEvent e)
                         x1 = e.getX();
                         y1 = e.getY();
                    public void mouseReleased(MouseEvent e)
                         x2 = e.getX();
                         y2 = e.getY();
                         repaint();
          addMouseMotionListener(
               new MouseMotionAdapter() {
                    public void mouseDragged(MouseEvent e)
                         x2 = e.getX();
                         y2 = e.getY();
                         repaint();
     public Dimension getPreferredSize();
          return new Dimension(150,100);
     public void paintComponent ( Graphics g)
          super.paintComponent(g);
          g.drawOval(Math.min(x1,x2),Math.min(y1,y2), Math.abs(x1 - x2), Math.abs(y1-y2) );
}

Answer 1

Here is the code re-posted correctly. I apologize for my hasty remarks.
//Fig 13.3 SelfContainedPanel.java
// A self-contained JPanel class that handles its own mouse events
//package com.deitel.jhtp3.ch13;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class SelfContainedPanel extends JPanel {
     private int x1,y1,x2,y2;
     public SelfContainedPanel()
          addMouseListener(
               new MouseAdapter() {
                    public void mousePressed(MouseEvent e)
                         x1 = e.getX();
                         y1 = e.getY();
                    public void mouseReleased(MouseEvent e)
                         x2 = e.getX();
                         y2 = e.getY();
                         repaint();
          addMouseMotionListener(
               new MouseMotionAdapter() {
                    public void mouseDragged(MouseEvent e)
                         x2 = e.getX();
                         y2 = e.getY();
                         repaint();
     public Dimension getPreferredSize();
          return new Dimension(150,100);
     public void paintComponent ( Graphics g)
          super.paintComponent(g);
          g.drawOval(Math.min(x1,x2),Math.min(y1,y2), Math.abs(x1 - x2), Math.abs(y1-y2) );
}